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                            <div style="color:gray; word-break: break-all; font-size:12px;">原英文版地址: <a href="https://www.elastic.co/guide/en/elasticsearch/reference/7.7/backup-cluster.html" rel="nofollow" target="_blank">https://www.elastic.co/guide/en/elasticsearch/reference/7.7/backup-cluster.html</a>, 原文档版权归 www.elastic.co 所有<br/>本地英文版地址: <a href="../en/backup-cluster.html" rel="nofollow" target="_blank">../en/backup-cluster.html</a></div>
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<strong>重要</strong>: 此版本不会发布额外的bug修复或文档更新。最新信息请参考 <a href="https://www.elastic.co/guide/en/elasticsearch/reference/current/index.html" rel="nofollow">当前版本文档</a>。
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<span class="breadcrumb-node">Back up a cluster</span>
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<a href="high-availability-cluster-design-large-clusters.html">« Resilience in larger clusters</a>
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<a href="backup-cluster-data.html">Back up a cluster’s data »</a>
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<h2 class="title">
<a id="backup-cluster"></a>Back up a cluster<a class="edit_me edit_me_private" rel="nofollow" title="Editing on GitHub is available to Elastic" href="https://github.com/elastic/elasticsearch/edit/7.7/docs/reference/high-availability/backup-cluster.asciidoc">edit</a>
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<p>You cannot back up an Elasticsearch cluster by simply copying
the data directories of all of its nodes. Elasticsearch may be making changes to
the contents of its data directories while it is running; copying its data
directories cannot be expected to capture a consistent picture of their contents.
If you try to restore a cluster from such a backup, it may fail and report
corruption and/or missing files. Alternatively, it may appear to have succeeded
though it silently lost some of its data. The only reliable way to back up a
cluster is by using the snapshot and restore functionality.</p>
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<p>To have a complete backup for your cluster:</p>
<div class="olist orderedlist">
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<a class="xref" href="backup-cluster-data.html" title="Back up a cluster’s data">Back up the data</a>
</li>
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<a class="xref" href="backup-cluster-configuration.html" title="Back up a cluster’s configuration">Back up the cluster configuration</a>
</li>
<li class="listitem">
<a class="xref" href="security-backup.html" title="Back up a cluster’s security configuration">Back up the security configuration</a>
</li>
</ol>
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<p>To restore your cluster from a backup:</p>
<div class="olist orderedlist">
<ol class="orderedlist">
<li class="listitem">
<a class="xref" href="restore-cluster-data.html" title="Restore a cluster’s data">Restore the data</a>
</li>
<li class="listitem">
<a class="xref" href="restore-security-configuration.html" title="Restore a cluster’s security configuration">Restore the security configuration</a>
</li>
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